Survey Quiz Feature

We thought a fun idea for this year could be to add quiz question in addition to the survey questions.

For example:

1. What was the name of Dave Shea's site that famously showcased CSS's flexibility?
- CSS Playground
- Style Paradise
- CSS Zen Garden
2. Which HTML element was commonly used for layouts before CSS?
- The `` element
- The `` element
- The `` element
3. Which of these is *not* a real CSS property?
- `caret-color`
- `font-synthesis`
- `background-opacity`
4. What year was CSS Grid support first introduced in browsers?
- 2013
- 2017
- 2020
5. What does "MDN" stand for?
- Microsoft Developer Network
- Mozilla Developer Network
- Minecraft Developer Network
6. What does "clearing a float" mean?
- Cancelling the effect of the `float` property so that the rest of the layout flows normally
- Making sure a numerical value is not so large that it will crash the browser
- Debugging `z-index` issues that arise when overlapping elements so that they "float" on top of one another
7. Which of these organizations maintains the CSS specifications?
- W3C
- W3Schools
- MDN
8. What year was CSS invented?
- 1994
- 1999
- 2005
9. Which of these is a valid CSS unit?
- `hmax`
- `rlh`
- `dfw`
10. Which of these is *not* a valid value for the `display` property?
- `display: revert;`
- `display: flow-root;`
- `display: box-item;`